“The most dangerous toxic mold in Alabama homes and business buildings is the mold growth that is often hidden from view inside ceilings, walls, floors, attics, crawl spaces, basements, heating/cooling air supply ducts, and room and wall air conditioners,” warns Mr. Fry, who is webmaster of the websites www.alabamamoldinspector.com and www.moldinspector, which has been online as a mold authority website since 1999.